title: Enhancement effects of flat-mirror reflection on plasma radiation.
abstract: Laser-induced breakdown spectroscopy quality can be improved by using a nanosecond Nd:YAG laser pulse to excite soil samples. To investigate how flat-mirror reflection affects the radiation characteristics of laser-induced plasma, emission spectra of sample elements were recorded using a grating spectrometer and photoelectric detection system. Placing a planar mirror vertically on the sample surface (10 mm mirror to plasma-center axis distance) for flat-mirror reflection increased spectral line intensities of Mg, Al, Fe, and Ba by 93.06%, 159.63%, 93.43%, and 94.61%, respectively. Signal-to-noise ratio increased by 17.56%, 40.21%, 31.29%, and 30%. The radiation enhancement mechanism was clarified using measured plasma parameters.
authors.forename: Jin-zhong
authors.initials: JZ
authors.lastname: Chen
authors.forename: Jin-ning
authors.initials: JN
authors.lastname: Bai
authors.forename: Guang-ju
authors.initials: GJ
authors.lastname: Song
authors.forename: Jiang
authors.initials: J
authors.lastname: Sun
authors.forename: Ze-chao
authors.initials: ZC
authors.lastname: Deng
authors.forename: Ying-long
authors.initials: YL
authors.lastname: Wang